AM79C202
features
Abrupt and smooth polarity reversal Power cross detection in ringing and nonringing states
Software programmable
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- DC loop feed characteristics and current limit Loop supervision detection thresholds Off-hook detect debounce interval Two-wire AC impedance Transhybrid balance Transmit and receive gains Equalization Digital I/O pins A-law/µ-law selection
patible with inexpensive protection networks. Acmodates low-tolerance fuse resistors while maintaining longitudinal balance to Bellcore specifications. Power/Service Denial state Small physical size Integrated ring-trip function Four relay drivers with built-in energy absorption zener diodes Synchronized ring relay operation: zero volts AC on, zero current off Software-enabled normal or automatic Ring-Trip state On-chip 12/16 k Hz metering generation with onand off-meter pulse shaping Supports loop-start and ground-start signaling. 0°C to 70°C mercial operation guaranteed by production...
